Swapping mother boards.

So as the title states, I currently have a SM-N900. I was messing around yesterday and I wanted to install A sm 900t motherboard in this device after installing the motherboard from my T-Mobile Note 3 put it back together and everything I want to power on my device and it wouldn't power on any idea what it could be. Any help is greatly appreciated I figured if I put the other motherboard and at least get some 4G LTE since I like it on here H+

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